v0.5.0

Walrus v0.5.0

Diff since v0.4.2

Breaking changes

Changed API for wind stress, surface heat exchange and wall stress to allow friction velocities to be precomputed (which causes a large speed up for all but the smallest of grids).

Additionally fixes a major error in the homogenous body heating.

Merged pull requests:

• added precomputed roughness length and friction velocity + fix bug (#5) (@jagoosw)
• Bug (#6) (@jagoosw)